diff --git a/com.oracle.truffle.r.native/fficall/src/jni/Rinternals.c b/com.oracle.truffle.r.native/fficall/src/jni/Rinternals.c
index 4a7fdffdd3cd064131e9ed347aecae97bd9c66df..af705d11e94160a54ca31a0d02fece4069410853 100644
--- a/com.oracle.truffle.r.native/fficall/src/jni/Rinternals.c
+++ b/com.oracle.truffle.r.native/fficall/src/jni/Rinternals.c
@@ -54,6 +54,7 @@ static jmethodID Rf_warningcallMethodID;
 static jmethodID Rf_warningMethodID;
 static jmethodID Rf_errorMethodID;
 static jmethodID Rf_NewHashedEnvMethodID;
+static jmethodID Rf_classgetsMethodID;
 static jmethodID Rf_rPsortMethodID;
 static jmethodID Rf_iPsortMethodID;
 static jmethodID RprintfMethodID;
@@ -154,6 +155,7 @@ void init_internals(JNIEnv *env) {
 	Rf_duplicateMethodID = checkGetMethodID(env, CallRFFIHelperClass, "Rf_duplicate", "(Ljava/lang/Object;I)Ljava/lang/Object;", 1);
 	Rf_anyDuplicatedMethodID = checkGetMethodID(env, CallRFFIHelperClass, "Rf_anyDuplicated", "(Ljava/lang/Object;I)I", 1);
 	Rf_NewHashedEnvMethodID = checkGetMethodID(env, CallRFFIHelperClass, "Rf_createNewEnv", "(Lcom/oracle/truffle/r/runtime/env/REnvironment;Ljava/lang/String;ZI)Lcom/oracle/truffle/r/runtime/env/REnvironment;", 1);
+	Rf_classgetsMethodID = checkGetMethodID(env, CallRFFIHelperClass, "Rf_classgets", "(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;", 1);
 	RprintfMethodID = checkGetMethodID(env, CallRFFIHelperClass, "printf", "(Ljava/lang/String;)V", 1);
 	R_do_MAKE_CLASS_MethodID = checkGetMethodID(env, CallRFFIHelperClass, "R_do_MAKE_CLASS", "(Ljava/lang/String;)Ljava/lang/Object;", 1);
 	R_FindNamespaceMethodID = checkGetMethodID(env, CallRFFIHelperClass, "R_FindNamespace", "(Ljava/lang/Object;)Ljava/lang/Object;", 1);
@@ -675,9 +677,10 @@ SEXP R_NewHashedEnv(SEXP parent, SEXP size) {
 	return checkRef(thisenv, result);
 }
 
-SEXP Rf_classgets(SEXP x, SEXP y) {
-	unimplemented("Rf_classgets");
-	return NULL;
+SEXP Rf_classgets(SEXP vec, SEXP klass) {
+	JNIEnv *thisenv = getEnv();
+	SEXP result = (*thisenv)->CallStaticObjectMethod(thisenv, RDataFactoryClass, Rf_classgetsMethodID, vec, klass);
+	return checkRef(thisenv, result);
 }
 
 const char *Rf_translateChar(SEXP x) {
diff --git a/com.oracle.truffle.r.runtime.ffi/src/com/oracle/truffle/r/runtime/ffi/jni/CallRFFIHelper.java b/com.oracle.truffle.r.runtime.ffi/src/com/oracle/truffle/r/runtime/ffi/jni/CallRFFIHelper.java
index 62dceba674c6d9765c1c085b05acb6b7e01bda16..17b709e42409978a85f50726d3b066533256a8bf 100644
--- a/com.oracle.truffle.r.runtime.ffi/src/com/oracle/truffle/r/runtime/ffi/jni/CallRFFIHelper.java
+++ b/com.oracle.truffle.r.runtime.ffi/src/com/oracle/truffle/r/runtime/ffi/jni/CallRFFIHelper.java
@@ -1377,4 +1377,10 @@ public class CallRFFIHelper {
         return x == y ? 1 : 0;
     }
 
+    public static Object Rf_classgets(Object x, Object y) {
+        RAbstractVector vector = guaranteeInstanceOf(x, RAbstractVector.class);
+        vector.setClassAttr(guaranteeInstanceOf(y, RStringVector.class));
+        return RNull.instance;
+    }
+
 }